ok, starting from home screen:
- click on "bsplayer free" icon
- click on a movie
- click on "menu" icon
- choose "subtitles" option
- choose "select active subtitle" option
- click on radio button next to name of subtitle file that is for this file (there is only one file there)
afterwards, after ~ 1-2 seconds, I get small popup with "error loading subtitle." message, and that's all.